Study On Synergistic Lubrication Between Textured Ring And Nano-lubricant

With the in-depth advancement of energy conservation and emission reduction,higher requirements are imposed on energy efficiency and emission standards.Ring-liner conjunction is the most important friction pair in internal combustion engine(ICE).The lubrication performance will have a direct effect on the power,economy and reliability of ICE.Therefore,research on ring is of great significance for improving the overall efficiency of ICE,increasing reliability and prolonging the service life.In this paper,based on the average Reynolds equation,a numerical model for hydrodynamic lubrication of single-row textured ring-liner conjunction is established.The Reynolds exit boundary conditions,asperity contact model,piston ring dynamics model,textured ring oil film thickness model and nano-lubricant rheological properties model are considered in the model.Relevant experimental verification is carried out by sample preparation.The test results are in good agreement with the simulation results,which verifies the correctness and accuracy of the numerical model.On this basis,the top compression ring of a gasoline engine is taken as the research object,and the research on the influence of texture and nano-lubricant on the lubrication performance of ring under rated conditions is carried out.The results show the texture forms oil wedges between ring and liner,which provides load carrying capacity and can effectively promote hydrodynamic lubrication.However,the reduction of effective contact area leads to the increase of wear;the addition of nanoparticles increases the viscosity and density of the lubricant,reduces wear,but also causes an increase in the viscous shear force of the fluid.Based on the above research results,the texture parameters are further optimized to study the synergy between surface texture and nano-lubricant.The results show that in order to reduce the friction and wear,the concentration of nanoparticles should be controlled within a certain range,and it exists an optimal synergistic lubrication model to achieve the best lubrication performance.This paper introduces surface texture and nano-lubricant and considers the synergy between the two aspects for the first time.The research work provides a new idea for improving the friction and lubrication performance of the piston ring.